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1/*
2 * Derived from arch/powerpc/kernel/iommu.c
3 *
4 * Copyright IBM Corporation, 2006-2007
5 * Copyright (C) 2006 Jon Mason <jdmason@kudzu.us>
6 *
7 * Author: Jon Mason <jdmason@kudzu.us>
8 * Author: Muli Ben-Yehuda <muli@il.ibm.com>
9
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25#define pr_fmt(fmt) "Calgary: " fmt
26
27#include <linux/kernel.h>
28#include <linux/init.h>
29#include <linux/types.h>
30#include <linux/slab.h>
31#include <linux/mm.h>
32#include <linux/spinlock.h>
33#include <linux/string.h>
34#include <linux/crash_dump.h>
35#include <linux/dma-mapping.h>
36#include <linux/bitmap.h>
37#include <linux/pci_ids.h>
38#include <linux/pci.h>
39#include <linux/delay.h>
40#include <linux/scatterlist.h>
41#include <linux/iommu-helper.h>
42
43#include <asm/iommu.h>
44#include <asm/calgary.h>
45#include <asm/tce.h>
46#include <asm/pci-direct.h>
47#include <asm/dma.h>
48#include <asm/rio.h>
49#include <asm/bios_ebda.h>
50#include <asm/x86_init.h>
51#include <asm/iommu_table.h>
52
53#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
54int use_calgary __read_mostly = 1;
55#else
56int use_calgary __read_mostly = 0;
57#endif /* CONFIG_CALGARY_DEFAULT_ENABLED */
58
59#define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
60#define PCI_DEVICE_ID_IBM_CALIOC2 0x0308
61
62/* register offsets inside the host bridge space */
63#define CALGARY_CONFIG_REG 0x0108
64#define PHB_CSR_OFFSET 0x0110 /* Channel Status */
65#define PHB_PLSSR_OFFSET 0x0120
66#define PHB_CONFIG_RW_OFFSET 0x0160
67#define PHB_IOBASE_BAR_LOW 0x0170
68#define PHB_IOBASE_BAR_HIGH 0x0180
69#define PHB_MEM_1_LOW 0x0190
70#define PHB_MEM_1_HIGH 0x01A0
71#define PHB_IO_ADDR_SIZE 0x01B0
72#define PHB_MEM_1_SIZE 0x01C0
73#define PHB_MEM_ST_OFFSET 0x01D0
74#define PHB_AER_OFFSET 0x0200
75#define PHB_CONFIG_0_HIGH 0x0220
76#define PHB_CONFIG_0_LOW 0x0230
77#define PHB_CONFIG_0_END 0x0240
78#define PHB_MEM_2_LOW 0x02B0
79#define PHB_MEM_2_HIGH 0x02C0
80#define PHB_MEM_2_SIZE_HIGH 0x02D0
81#define PHB_MEM_2_SIZE_LOW 0x02E0
82#define PHB_DOSHOLE_OFFSET 0x08E0
83
84/* CalIOC2 specific */
85#define PHB_SAVIOR_L2 0x0DB0
86#define PHB_PAGE_MIG_CTRL 0x0DA8
87#define PHB_PAGE_MIG_DEBUG 0x0DA0
88#define PHB_ROOT_COMPLEX_STATUS 0x0CB0
89
90/* PHB_CONFIG_RW */
91#define PHB_TCE_ENABLE 0x20000000
92#define PHB_SLOT_DISABLE 0x1C000000
93#define PHB_DAC_DISABLE 0x01000000
94#define PHB_MEM2_ENABLE 0x00400000
95#define PHB_MCSR_ENABLE 0x00100000
96/* TAR (Table Address Register) */
97#define TAR_SW_BITS 0x0000ffffffff800fUL
98#define TAR_VALID 0x0000000000000008UL
99/* CSR (Channel/DMA Status Register) */
100#define CSR_AGENT_MASK 0xffe0ffff
101/* CCR (Calgary Configuration Register) */
102#define CCR_2SEC_TIMEOUT 0x000000000000000EUL
103/* PMCR/PMDR (Page Migration Control/Debug Registers */
104#define PMR_SOFTSTOP 0x80000000
105#define PMR_SOFTSTOPFAULT 0x40000000
106#define PMR_HARDSTOP 0x20000000
107
108/*
109 * The maximum PHB bus number.
110 * x3950M2 (rare): 8 chassis, 48 PHBs per chassis = 384
111 * x3950M2: 4 chassis, 48 PHBs per chassis = 192
112 * x3950 (PCIE): 8 chassis, 32 PHBs per chassis = 256
113 * x3950 (PCIX): 8 chassis, 16 PHBs per chassis = 128
114 */
115#define MAX_PHB_BUS_NUM 256
116
117#define PHBS_PER_CALGARY 4
118
119/* register offsets in Calgary's internal register space */
120static const unsigned long tar_offsets[] = {
121 0x0580 /* TAR0 */,
122 0x0588 /* TAR1 */,
123 0x0590 /* TAR2 */,
124 0x0598 /* TAR3 */
125};
126
127static const unsigned long split_queue_offsets[] = {
128 0x4870 /* SPLIT QUEUE 0 */,
129 0x5870 /* SPLIT QUEUE 1 */,
130 0x6870 /* SPLIT QUEUE 2 */,
131 0x7870 /* SPLIT QUEUE 3 */
132};
133
134static const unsigned long phb_offsets[] = {
135 0x8000 /* PHB0 */,
136 0x9000 /* PHB1 */,
137 0xA000 /* PHB2 */,
138 0xB000 /* PHB3 */
139};
140
141/* PHB debug registers */
142
143static const unsigned long phb_debug_offsets[] = {
144 0x4000 /* PHB 0 DEBUG */,
145 0x5000 /* PHB 1 DEBUG */,
146 0x6000 /* PHB 2 DEBUG */,
147 0x7000 /* PHB 3 DEBUG */
148};
149
150/*
151 * STUFF register for each debug PHB,
152 * byte 1 = start bus number, byte 2 = end bus number
153 */
154
155#define PHB_DEBUG_STUFF_OFFSET 0x0020
156
157#define EMERGENCY_PAGES 32 /* = 128KB */
158
159unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
160static int translate_empty_slots __read_mostly = 0;
161static int calgary_detected __read_mostly = 0;
162
163static struct rio_table_hdr *rio_table_hdr __initdata;
164static struct scal_detail *scal_devs[MAX_NUMNODES] __initdata;
165static struct rio_detail *rio_devs[MAX_NUMNODES * 4] __initdata;
166
167struct calgary_bus_info {
168 void *tce_space;
169 unsigned char translation_disabled;
170 signed char phbid;
171 void __iomem *bbar;
172};
173
174static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
175static void calgary_tce_cache_blast(struct iommu_table *tbl);
176static void calgary_dump_error_regs(struct iommu_table *tbl);
177static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
178static void calioc2_tce_cache_blast(struct iommu_table *tbl);
179static void calioc2_dump_error_regs(struct iommu_table *tbl);
180static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl);
181static void get_tce_space_from_tar(void);
182
183static const struct cal_chipset_ops calgary_chip_ops = {
184 .handle_quirks = calgary_handle_quirks,
185 .tce_cache_blast = calgary_tce_cache_blast,
186 .dump_error_regs = calgary_dump_error_regs
187};
188
189static const struct cal_chipset_ops calioc2_chip_ops = {
190 .handle_quirks = calioc2_handle_quirks,
191 .tce_cache_blast = calioc2_tce_cache_blast,
192 .dump_error_regs = calioc2_dump_error_regs
193};
194
195static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
196
197static inline int translation_enabled(struct iommu_table *tbl)
198{
199 /* only PHBs with translation enabled have an IOMMU table */
200 return (tbl != NULL);
201}
202
203static void iommu_range_reserve(struct iommu_table *tbl,
204 unsigned long start_addr, unsigned int npages)
205{
206 unsigned long index;
207 unsigned long end;
208 unsigned long flags;
209
210 index = start_addr >> PAGE_SHIFT;
211
212 /* bail out if we're asked to reserve a region we don't cover */
213 if (index >= tbl->it_size)
214 return;
215
216 end = index + npages;
217 if (end > tbl->it_size) /* don't go off the table */
218 end = tbl->it_size;
219
220 spin_lock_irqsave(&tbl->it_lock, flags);
221
222 bitmap_set(tbl->it_map, index, npages);
223
224 spin_unlock_irqrestore(&tbl->it_lock, flags);
225}
226
227static unsigned long iommu_range_alloc(struct device *dev,
228 struct iommu_table *tbl,
229 unsigned int npages)
230{
231 unsigned long flags;
232 unsigned long offset;
233 unsigned long boundary_size;
234
235 boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
236 PAGE_SIZE) >> PAGE_SHIFT;
237
238 BUG_ON(npages == 0);
239
240 spin_lock_irqsave(&tbl->it_lock, flags);
241
242 offset = iommu_area_alloc(tbl->it_map, tbl->it_size, tbl->it_hint,
243 npages, 0, boundary_size, 0);
244 if (offset == ~0UL) {
245 tbl->chip_ops->tce_cache_blast(tbl);
246
247 offset = iommu_area_alloc(tbl->it_map, tbl->it_size, 0,
248 npages, 0, boundary_size, 0);
249 if (offset == ~0UL) {
250 pr_warn("IOMMU full\n");
251 spin_unlock_irqrestore(&tbl->it_lock, flags);
252 if (panic_on_overflow)
253 panic("Calgary: fix the allocator.\n");
254 else
255 return DMA_ERROR_CODE;
256 }
257 }
258
259 tbl->it_hint = offset + npages;
260 BUG_ON(tbl->it_hint > tbl->it_size);
261
262 spin_unlock_irqrestore(&tbl->it_lock, flags);
263
264 return offset;
265}
266
267static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
268 void *vaddr, unsigned int npages, int direction)
269{
270 unsigned long entry;
271 dma_addr_t ret;
272
273 entry = iommu_range_alloc(dev, tbl, npages);
274
275 if (unlikely(entry == DMA_ERROR_CODE)) {
276 pr_warn("failed to allocate %u pages in iommu %p\n",
277 npages, tbl);
278 return DMA_ERROR_CODE;
279 }
280
281 /* set the return dma address */
282 ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
283
284 /* put the TCEs in the HW table */
285 tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
286 direction);
287 return ret;
288}
289
290static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
291 unsigned int npages)
292{
293 unsigned long entry;
294 unsigned long badend;
295 unsigned long flags;
296
297 /* were we called with bad_dma_address? */
298 badend = DMA_ERROR_CODE + (EMERGENCY_PAGES * PAGE_SIZE);
299 if (unlikely((dma_addr >= DMA_ERROR_CODE) && (dma_addr < badend))) {
300 WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
301 "address 0x%Lx\n", dma_addr);
302 return;
303 }
304
305 entry = dma_addr >> PAGE_SHIFT;
306
307 BUG_ON(entry + npages > tbl->it_size);
308
309 tce_free(tbl, entry, npages);
310
311 spin_lock_irqsave(&tbl->it_lock, flags);
312
313 bitmap_clear(tbl->it_map, entry, npages);
314
315 spin_unlock_irqrestore(&tbl->it_lock, flags);
316}
317
318static inline struct iommu_table *find_iommu_table(struct device *dev)
319{
320 struct pci_dev *pdev;
321 struct pci_bus *pbus;
322 struct iommu_table *tbl;
323
324 pdev = to_pci_dev(dev);
325
326 /* search up the device tree for an iommu */
327 pbus = pdev->bus;
328 do {
329 tbl = pci_iommu(pbus);
330 if (tbl && tbl->it_busno == pbus->number)
331 break;
332 tbl = NULL;
333 pbus = pbus->parent;
334 } while (pbus);
335
336 BUG_ON(tbl && (tbl->it_busno != pbus->number));
337
338 return tbl;
339}
340
341static void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
342 int nelems,enum dma_data_direction dir,
343 struct dma_attrs *attrs)
344{
345 struct iommu_table *tbl = find_iommu_table(dev);
346 struct scatterlist *s;
347 int i;
348
349 if (!translation_enabled(tbl))
350 return;
351
352 for_each_sg(sglist, s, nelems, i) {
353 unsigned int npages;
354 dma_addr_t dma = s->dma_address;
355 unsigned int dmalen = s->dma_length;
356
357 if (dmalen == 0)
358 break;
359
360 npages = iommu_num_pages(dma, dmalen, PAGE_SIZE);
361 iommu_free(tbl, dma, npages);
362 }
363}
364
365static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
366 int nelems, enum dma_data_direction dir,
367 struct dma_attrs *attrs)
368{
369 struct iommu_table *tbl = find_iommu_table(dev);
370 struct scatterlist *s;
371 unsigned long vaddr;
372 unsigned int npages;
373 unsigned long entry;
374 int i;
375
376 for_each_sg(sg, s, nelems, i) {
377 BUG_ON(!sg_page(s));
378
379 vaddr = (unsigned long) sg_virt(s);
380 npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);
381
382 entry = iommu_range_alloc(dev, tbl, npages);
383 if (entry == DMA_ERROR_CODE) {
384 /* makes sure unmap knows to stop */
385 s->dma_length = 0;
386 goto error;
387 }
388
389 s->dma_address = (entry << PAGE_SHIFT) | s->offset;
390
391 /* insert into HW table */
392 tce_build(tbl, entry, npages, vaddr & PAGE_MASK, dir);
393
394 s->dma_length = s->length;
395 }
396
397 return nelems;
398error:
399 calgary_unmap_sg(dev, sg, nelems, dir, NULL);
400 for_each_sg(sg, s, nelems, i) {
401 sg->dma_address = DMA_ERROR_CODE;
402 sg->dma_length = 0;
403 }
404 return 0;
405}
406
407static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
408 unsigned long offset, size_t size,
409 enum dma_data_direction dir,
410 struct dma_attrs *attrs)
411{
412 void *vaddr = page_address(page) + offset;
413 unsigned long uaddr;
414 unsigned int npages;
415 struct iommu_table *tbl = find_iommu_table(dev);
416
417 uaddr = (unsigned long)vaddr;
418 npages = iommu_num_pages(uaddr, size, PAGE_SIZE);
419
420 return iommu_alloc(dev, tbl, vaddr, npages, dir);
421}
422
423static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
424 size_t size, enum dma_data_direction dir,
425 struct dma_attrs *attrs)
426{
427 struct iommu_table *tbl = find_iommu_table(dev);
428 unsigned int npages;
429
430 npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
431 iommu_free(tbl, dma_addr, npages);
432}
433
434static void* calgary_alloc_coherent(struct device *dev, size_t size,
435 dma_addr_t *dma_handle, gfp_t flag, struct dma_attrs *attrs)
436{
437 void *ret = NULL;
438 dma_addr_t mapping;
439 unsigned int npages, order;
440 struct iommu_table *tbl = find_iommu_table(dev);
441
442 size = PAGE_ALIGN(size); /* size rounded up to full pages */
443 npages = size >> PAGE_SHIFT;
444 order = get_order(size);
445
446 flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
447
448 /* alloc enough pages (and possibly more) */
449 ret = (void *)__get_free_pages(flag, order);
450 if (!ret)
451 goto error;
452 memset(ret, 0, size);
453
454 /* set up tces to cover the allocated range */
455 mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
456 if (mapping == DMA_ERROR_CODE)
457 goto free;
458 *dma_handle = mapping;
459 return ret;
460free:
461 free_pages((unsigned long)ret, get_order(size));
462 ret = NULL;
463error:
464 return ret;
465}
466
467static void calgary_free_coherent(struct device *dev, size_t size,
468 void *vaddr, dma_addr_t dma_handle,
469 struct dma_attrs *attrs)
470{
471 unsigned int npages;
472 struct iommu_table *tbl = find_iommu_table(dev);
473
474 size = PAGE_ALIGN(size);
475 npages = size >> PAGE_SHIFT;
476
477 iommu_free(tbl, dma_handle, npages);
478 free_pages((unsigned long)vaddr, get_order(size));
479}
480
481static struct dma_map_ops calgary_dma_ops = {
482 .alloc = calgary_alloc_coherent,
483 .free = calgary_free_coherent,
484 .map_sg = calgary_map_sg,
485 .unmap_sg = calgary_unmap_sg,
486 .map_page = calgary_map_page,
487 .unmap_page = calgary_unmap_page,
488};
489
490static inline void __iomem * busno_to_bbar(unsigned char num)
491{
492 return bus_info[num].bbar;
493}
494
495static inline int busno_to_phbid(unsigned char num)
496{
497 return bus_info[num].phbid;
498}
499
500static inline unsigned long split_queue_offset(unsigned char num)
501{
502 size_t idx = busno_to_phbid(num);
503
504 return split_queue_offsets[idx];
505}
506
507static inline unsigned long tar_offset(unsigned char num)
508{
509 size_t idx = busno_to_phbid(num);
510
511 return tar_offsets[idx];
512}
513
514static inline unsigned long phb_offset(unsigned char num)
515{
516 size_t idx = busno_to_phbid(num);
517
518 return phb_offsets[idx];
519}
520
521static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
522{
523 unsigned long target = ((unsigned long)bar) | offset;
524 return (void __iomem*)target;
525}
526
527static inline int is_calioc2(unsigned short device)
528{
529 return (device == PCI_DEVICE_ID_IBM_CALIOC2);
530}
531
532static inline int is_calgary(unsigned short device)
533{
534 return (device == PCI_DEVICE_ID_IBM_CALGARY);
535}
536
537static inline int is_cal_pci_dev(unsigned short device)
538{
539 return (is_calgary(device) || is_calioc2(device));
540}
541
542static void calgary_tce_cache_blast(struct iommu_table *tbl)
543{
544 u64 val;
545 u32 aer;
546 int i = 0;
547 void __iomem *bbar = tbl->bbar;
548 void __iomem *target;
549
550 /* disable arbitration on the bus */
551 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
552 aer = readl(target);
553 writel(0, target);
554
555 /* read plssr to ensure it got there */
556 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
557 val = readl(target);
558
559 /* poll split queues until all DMA activity is done */
560 target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
561 do {
562 val = readq(target);
563 i++;
564 } while ((val & 0xff) != 0xff && i < 100);
565 if (i == 100)
566 pr_warn("PCI bus not quiesced, continuing anyway\n");
567
568 /* invalidate TCE cache */
569 target = calgary_reg(bbar, tar_offset(tbl->it_busno));
570 writeq(tbl->tar_val, target);
571
572 /* enable arbitration */
573 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
574 writel(aer, target);
575 (void)readl(target); /* flush */
576}
577
578static void calioc2_tce_cache_blast(struct iommu_table *tbl)
579{
580 void __iomem *bbar = tbl->bbar;
581 void __iomem *target;
582 u64 val64;
583 u32 val;
584 int i = 0;
585 int count = 1;
586 unsigned char bus = tbl->it_busno;
587
588begin:
589 printk(KERN_DEBUG "Calgary: CalIOC2 bus 0x%x entering tce cache blast "
590 "sequence - count %d\n", bus, count);
591
592 /* 1. using the Page Migration Control reg set SoftStop */
593 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
594 val = be32_to_cpu(readl(target));
595 printk(KERN_DEBUG "1a. read 0x%x [LE] from %p\n", val, target);
596 val |= PMR_SOFTSTOP;
597 printk(KERN_DEBUG "1b. writing 0x%x [LE] to %p\n", val, target);
598 writel(cpu_to_be32(val), target);
599
600 /* 2. poll split queues until all DMA activity is done */
601 printk(KERN_DEBUG "2a. starting to poll split queues\n");
602 target = calgary_reg(bbar, split_queue_offset(bus));
603 do {
604 val64 = readq(target);
605 i++;
606 } while ((val64 & 0xff) != 0xff && i < 100);
607 if (i == 100)
608 pr_warn("CalIOC2: PCI bus not quiesced, continuing anyway\n");
609
610 /* 3. poll Page Migration DEBUG for SoftStopFault */
611 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
612 val = be32_to_cpu(readl(target));
613 printk(KERN_DEBUG "3. read 0x%x [LE] from %p\n", val, target);
614
615 /* 4. if SoftStopFault - goto (1) */
616 if (val & PMR_SOFTSTOPFAULT) {
617 if (++count < 100)
618 goto begin;
619 else {
620 pr_warn("CalIOC2: too many SoftStopFaults, aborting TCE cache flush sequence!\n");
621 return; /* pray for the best */
622 }
623 }
624
625 /* 5. Slam into HardStop by reading PHB_PAGE_MIG_CTRL */
626 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
627 printk(KERN_DEBUG "5a. slamming into HardStop by reading %p\n", target);
628 val = be32_to_cpu(readl(target));
629 printk(KERN_DEBUG "5b. read 0x%x [LE] from %p\n", val, target);
630 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
631 val = be32_to_cpu(readl(target));
632 printk(KERN_DEBUG "5c. read 0x%x [LE] from %p (debug)\n", val, target);
633
634 /* 6. invalidate TCE cache */
635 printk(KERN_DEBUG "6. invalidating TCE cache\n");
636 target = calgary_reg(bbar, tar_offset(bus));
637 writeq(tbl->tar_val, target);
638
639 /* 7. Re-read PMCR */
640 printk(KERN_DEBUG "7a. Re-reading PMCR\n");
641 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
642 val = be32_to_cpu(readl(target));
643 printk(KERN_DEBUG "7b. read 0x%x [LE] from %p\n", val, target);
644
645 /* 8. Remove HardStop */
646 printk(KERN_DEBUG "8a. removing HardStop from PMCR\n");
647 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
648 val = 0;
649 printk(KERN_DEBUG "8b. writing 0x%x [LE] to %p\n", val, target);
650 writel(cpu_to_be32(val), target);
651 val = be32_to_cpu(readl(target));
652 printk(KERN_DEBUG "8c. read 0x%x [LE] from %p\n", val, target);
653}
654
655static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
656 u64 limit)
657{
658 unsigned int numpages;
659
660 limit = limit | 0xfffff;
661 limit++;
662
663 numpages = ((limit - start) >> PAGE_SHIFT);
664 iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
665}
666
667static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
668{
669 void __iomem *target;
670 u64 low, high, sizelow;
671 u64 start, limit;
672 struct iommu_table *tbl = pci_iommu(dev->bus);
673 unsigned char busnum = dev->bus->number;
674 void __iomem *bbar = tbl->bbar;
675
676 /* peripheral MEM_1 region */
677 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
678 low = be32_to_cpu(readl(target));
679 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
680 high = be32_to_cpu(readl(target));
681 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
682 sizelow = be32_to_cpu(readl(target));
683
684 start = (high << 32) | low;
685 limit = sizelow;
686
687 calgary_reserve_mem_region(dev, start, limit);
688}
689
690static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
691{
692 void __iomem *target;
693 u32 val32;
694 u64 low, high, sizelow, sizehigh;
695 u64 start, limit;
696 struct iommu_table *tbl = pci_iommu(dev->bus);
697 unsigned char busnum = dev->bus->number;
698 void __iomem *bbar = tbl->bbar;
699
700 /* is it enabled? */
701 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
702 val32 = be32_to_cpu(readl(target));
703 if (!(val32 & PHB_MEM2_ENABLE))
704 return;
705
706 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
707 low = be32_to_cpu(readl(target));
708 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
709 high = be32_to_cpu(readl(target));
710 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
711 sizelow = be32_to_cpu(readl(target));
712 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
713 sizehigh = be32_to_cpu(readl(target));
714
715 start = (high << 32) | low;
716 limit = (sizehigh << 32) | sizelow;
717
718 calgary_reserve_mem_region(dev, start, limit);
719}
720
721/*
722 * some regions of the IO address space do not get translated, so we
723 * must not give devices IO addresses in those regions. The regions
724 * are the 640KB-1MB region and the two PCI peripheral memory holes.
725 * Reserve all of them in the IOMMU bitmap to avoid giving them out
726 * later.
727 */
728static void __init calgary_reserve_regions(struct pci_dev *dev)
729{
730 unsigned int npages;
731 u64 start;
732 struct iommu_table *tbl = pci_iommu(dev->bus);
733
734 /* reserve EMERGENCY_PAGES from bad_dma_address and up */
735 iommu_range_reserve(tbl, DMA_ERROR_CODE, EMERGENCY_PAGES);
736
737 /* avoid the BIOS/VGA first 640KB-1MB region */
738 /* for CalIOC2 - avoid the entire first MB */
739 if (is_calgary(dev->device)) {
740 start = (640 * 1024);
741 npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
742 } else { /* calioc2 */
743 start = 0;
744 npages = (1 * 1024 * 1024) >> PAGE_SHIFT;
745 }
746 iommu_range_reserve(tbl, start, npages);
747
748 /* reserve the two PCI peripheral memory regions in IO space */
749 calgary_reserve_peripheral_mem_1(dev);
750 calgary_reserve_peripheral_mem_2(dev);
751}
752
753static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
754{
755 u64 val64;
756 u64 table_phys;
757 void __iomem *target;
758 int ret;
759 struct iommu_table *tbl;
760
761 /* build TCE tables for each PHB */
762 ret = build_tce_table(dev, bbar);
763 if (ret)
764 return ret;
765
766 tbl = pci_iommu(dev->bus);
767 tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
768
769 if (is_kdump_kernel())
770 calgary_init_bitmap_from_tce_table(tbl);
771 else
772 tce_free(tbl, 0, tbl->it_size);
773
774 if (is_calgary(dev->device))
775 tbl->chip_ops = &calgary_chip_ops;
776 else if (is_calioc2(dev->device))
777 tbl->chip_ops = &calioc2_chip_ops;
778 else
779 BUG();
780
781 calgary_reserve_regions(dev);
782
783 /* set TARs for each PHB */
784 target = calgary_reg(bbar, tar_offset(dev->bus->number));
785 val64 = be64_to_cpu(readq(target));
786
787 /* zero out all TAR bits under sw control */
788 val64 &= ~TAR_SW_BITS;
789 table_phys = (u64)__pa(tbl->it_base);
790
791 val64 |= table_phys;
792
793 BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
794 val64 |= (u64) specified_table_size;
795
796 tbl->tar_val = cpu_to_be64(val64);
797
798 writeq(tbl->tar_val, target);
799 readq(target); /* flush */
800
801 return 0;
802}
803
804static void __init calgary_free_bus(struct pci_dev *dev)
805{
806 u64 val64;
807 struct iommu_table *tbl = pci_iommu(dev->bus);
808 void __iomem *target;
809 unsigned int bitmapsz;
810
811 target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
812 val64 = be64_to_cpu(readq(target));
813 val64 &= ~TAR_SW_BITS;
814 writeq(cpu_to_be64(val64), target);
815 readq(target); /* flush */
816
817 bitmapsz = tbl->it_size / BITS_PER_BYTE;
818 free_pages((unsigned long)tbl->it_map, get_order(bitmapsz));
819 tbl->it_map = NULL;
820
821 kfree(tbl);
822
823 set_pci_iommu(dev->bus, NULL);
824
825 /* Can't free bootmem allocated memory after system is up :-( */
826 bus_info[dev->bus->number].tce_space = NULL;
827}
828
829static void calgary_dump_error_regs(struct iommu_table *tbl)
830{
831 void __iomem *bbar = tbl->bbar;
832 void __iomem *target;
833 u32 csr, plssr;
834
835 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
836 csr = be32_to_cpu(readl(target));
837
838 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
839 plssr = be32_to_cpu(readl(target));
840
841 /* If no error, the agent ID in the CSR is not valid */
842 pr_emerg("DMA error on Calgary PHB 0x%x, 0x%08x@CSR 0x%08x@PLSSR\n",
843 tbl->it_busno, csr, plssr);
844}
845
846static void calioc2_dump_error_regs(struct iommu_table *tbl)
847{
848 void __iomem *bbar = tbl->bbar;
849 u32 csr, csmr, plssr, mck, rcstat;
850 void __iomem *target;
851 unsigned long phboff = phb_offset(tbl->it_busno);
852 unsigned long erroff;
853 u32 errregs[7];
854 int i;
855
856 /* dump CSR */
857 target = calgary_reg(bbar, phboff | PHB_CSR_OFFSET);
858 csr = be32_to_cpu(readl(target));
859 /* dump PLSSR */
860 target = calgary_reg(bbar, phboff | PHB_PLSSR_OFFSET);
861 plssr = be32_to_cpu(readl(target));
862 /* dump CSMR */
863 target = calgary_reg(bbar, phboff | 0x290);
864 csmr = be32_to_cpu(readl(target));
865 /* dump mck */
866 target = calgary_reg(bbar, phboff | 0x800);
867 mck = be32_to_cpu(readl(target));
868
869 pr_emerg("DMA error on CalIOC2 PHB 0x%x\n", tbl->it_busno);
870
871 pr_emerg("0x%08x@CSR 0x%08x@PLSSR 0x%08x@CSMR 0x%08x@MCK\n",
872 csr, plssr, csmr, mck);
873
874 /* dump rest of error regs */
875 pr_emerg("");
876 for (i = 0; i < ARRAY_SIZE(errregs); i++) {
877 /* err regs are at 0x810 - 0x870 */
878 erroff = (0x810 + (i * 0x10));
879 target = calgary_reg(bbar, phboff | erroff);
880 errregs[i] = be32_to_cpu(readl(target));
881 pr_cont("0x%08x@0x%lx ", errregs[i], erroff);
882 }
883 pr_cont("\n");
884
885 /* root complex status */
886 target = calgary_reg(bbar, phboff | PHB_ROOT_COMPLEX_STATUS);
887 rcstat = be32_to_cpu(readl(target));
888 printk(KERN_EMERG "Calgary: 0x%08x@0x%x\n", rcstat,
889 PHB_ROOT_COMPLEX_STATUS);
890}
891
892static void calgary_watchdog(unsigned long data)
893{
894 struct pci_dev *dev = (struct pci_dev *)data;
895 struct iommu_table *tbl = pci_iommu(dev->bus);
896 void __iomem *bbar = tbl->bbar;
897 u32 val32;
898 void __iomem *target;
899
900 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
901 val32 = be32_to_cpu(readl(target));
902
903 /* If no error, the agent ID in the CSR is not valid */
904 if (val32 & CSR_AGENT_MASK) {
905 tbl->chip_ops->dump_error_regs(tbl);
906
907 /* reset error */
908 writel(0, target);
909
910 /* Disable bus that caused the error */
911 target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
912 PHB_CONFIG_RW_OFFSET);
913 val32 = be32_to_cpu(readl(target));
914 val32 |= PHB_SLOT_DISABLE;
915 writel(cpu_to_be32(val32), target);
916 readl(target); /* flush */
917 } else {
918 /* Reset the timer */
919 mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
920 }
921}
922
923static void __init calgary_set_split_completion_timeout(void __iomem *bbar,
924 unsigned char busnum, unsigned long timeout)
925{
926 u64 val64;
927 void __iomem *target;
928 unsigned int phb_shift = ~0; /* silence gcc */
929 u64 mask;
930
931 switch (busno_to_phbid(busnum)) {
932 case 0: phb_shift = (63 - 19);
933 break;
934 case 1: phb_shift = (63 - 23);
935 break;
936 case 2: phb_shift = (63 - 27);
937 break;
938 case 3: phb_shift = (63 - 35);
939 break;
940 default:
941 BUG_ON(busno_to_phbid(busnum));
942 }
943
944 target = calgary_reg(bbar, CALGARY_CONFIG_REG);
945 val64 = be64_to_cpu(readq(target));
946
947 /* zero out this PHB's timer bits */
948 mask = ~(0xFUL << phb_shift);
949 val64 &= mask;
950 val64 |= (timeout << phb_shift);
951 writeq(cpu_to_be64(val64), target);
952 readq(target); /* flush */
953}
954
955static void __init calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
956{
957 unsigned char busnum = dev->bus->number;
958 void __iomem *bbar = tbl->bbar;
959 void __iomem *target;
960 u32 val;
961
962 /*
963 * CalIOC2 designers recommend setting bit 8 in 0xnDB0 to 1
964 */
965 target = calgary_reg(bbar, phb_offset(busnum) | PHB_SAVIOR_L2);
966 val = cpu_to_be32(readl(target));
967 val |= 0x00800000;
968 writel(cpu_to_be32(val), target);
969}
970
971static void __init calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
972{
973 unsigned char busnum = dev->bus->number;
974
975 /*
976 * Give split completion a longer timeout on bus 1 for aic94xx
977 * http://bugzilla.kernel.org/show_bug.cgi?id=7180
978 */
979 if (is_calgary(dev->device) && (busnum == 1))
980 calgary_set_split_completion_timeout(tbl->bbar, busnum,
981 CCR_2SEC_TIMEOUT);
982}
983
984static void __init calgary_enable_translation(struct pci_dev *dev)
985{
986 u32 val32;
987 unsigned char busnum;
988 void __iomem *target;
989 void __iomem *bbar;
990 struct iommu_table *tbl;
991
992 busnum = dev->bus->number;
993 tbl = pci_iommu(dev->bus);
994 bbar = tbl->bbar;
995
996 /* enable TCE in PHB Config Register */
997 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
998 val32 = be32_to_cpu(readl(target));
999 val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
1000
1001 printk(KERN_INFO "Calgary: enabling translation on %s PHB %#x\n",
1002 (dev->device == PCI_DEVICE_ID_IBM_CALGARY) ?
1003 "Calgary" : "CalIOC2", busnum);
1004 printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
1005 "bus.\n");
1006
1007 writel(cpu_to_be32(val32), target);
1008 readl(target); /* flush */
1009
1010 init_timer(&tbl->watchdog_timer);
1011 tbl->watchdog_timer.function = &calgary_watchdog;
1012 tbl->watchdog_timer.data = (unsigned long)dev;
1013 mod_timer(&tbl->watchdog_timer, jiffies);
1014}
1015
1016static void __init calgary_disable_translation(struct pci_dev *dev)
1017{
1018 u32 val32;
1019 unsigned char busnum;
1020 void __iomem *target;
1021 void __iomem *bbar;
1022 struct iommu_table *tbl;
1023
1024 busnum = dev->bus->number;
1025 tbl = pci_iommu(dev->bus);
1026 bbar = tbl->bbar;
1027
1028 /* disable TCE in PHB Config Register */
1029 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
1030 val32 = be32_to_cpu(readl(target));
1031 val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
1032
1033 printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
1034 writel(cpu_to_be32(val32), target);
1035 readl(target); /* flush */
1036
1037 del_timer_sync(&tbl->watchdog_timer);
1038}
1039
1040static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
1041{
1042 pci_dev_get(dev);
1043 set_pci_iommu(dev->bus, NULL);
1044
1045 /* is the device behind a bridge? */
1046 if (dev->bus->parent)
1047 dev->bus->parent->self = dev;
1048 else
1049 dev->bus->self = dev;
1050}
1051
1052static int __init calgary_init_one(struct pci_dev *dev)
1053{
1054 void __iomem *bbar;
1055 struct iommu_table *tbl;
1056 int ret;
1057
1058 bbar = busno_to_bbar(dev->bus->number);
1059 ret = calgary_setup_tar(dev, bbar);
1060 if (ret)
1061 goto done;
1062
1063 pci_dev_get(dev);
1064
1065 if (dev->bus->parent) {
1066 if (dev->bus->parent->self)
1067 printk(KERN_WARNING "Calgary: IEEEE, dev %p has "
1068 "bus->parent->self!\n", dev);
1069 dev->bus->parent->self = dev;
1070 } else
1071 dev->bus->self = dev;
1072
1073 tbl = pci_iommu(dev->bus);
1074 tbl->chip_ops->handle_quirks(tbl, dev);
1075
1076 calgary_enable_translation(dev);
1077
1078 return 0;
1079
1080done:
1081 return ret;
1082}
1083
1084static int __init calgary_locate_bbars(void)
1085{
1086 int ret;
1087 int rioidx, phb, bus;
1088 void __iomem *bbar;
1089 void __iomem *target;
1090 unsigned long offset;
1091 u8 start_bus, end_bus;
1092 u32 val;
1093
1094 ret = -ENODATA;
1095 for (rioidx = 0; rioidx < rio_table_hdr->num_rio_dev; rioidx++) {
1096 struct rio_detail *rio = rio_devs[rioidx];
1097
1098 if ((rio->type != COMPAT_CALGARY) && (rio->type != ALT_CALGARY))
1099 continue;
1100
1101 /* map entire 1MB of Calgary config space */
1102 bbar = ioremap_nocache(rio->BBAR, 1024 * 1024);
1103 if (!bbar)
1104 goto error;
1105
1106 for (phb = 0; phb < PHBS_PER_CALGARY; phb++) {
1107 offset = phb_debug_offsets[phb] | PHB_DEBUG_STUFF_OFFSET;
1108 target = calgary_reg(bbar, offset);
1109
1110 val = be32_to_cpu(readl(target));
1111
1112 start_bus = (u8)((val & 0x00FF0000) >> 16);
1113 end_bus = (u8)((val & 0x0000FF00) >> 8);
1114
1115 if (end_bus) {
1116 for (bus = start_bus; bus <= end_bus; bus++) {
1117 bus_info[bus].bbar = bbar;
1118 bus_info[bus].phbid = phb;
1119 }
1120 } else {
1121 bus_info[start_bus].bbar = bbar;
1122 bus_info[start_bus].phbid = phb;
1123 }
1124 }
1125 }
1126
1127 return 0;
1128
1129error:
1130 /* scan bus_info and iounmap any bbars we previously ioremap'd */
1131 for (bus = 0; bus < ARRAY_SIZE(bus_info); bus++)
1132 if (bus_info[bus].bbar)
1133 iounmap(bus_info[bus].bbar);
1134
1135 return ret;
1136}
1137
1138static int __init calgary_init(void)
1139{
1140 int ret;
1141 struct pci_dev *dev = NULL;
1142 struct calgary_bus_info *info;
1143
1144 ret = calgary_locate_bbars();
1145 if (ret)
1146 return ret;
1147
1148 /* Purely for kdump kernel case */
1149 if (is_kdump_kernel())
1150 get_tce_space_from_tar();
1151
1152 do {
1153 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1154 if (!dev)
1155 break;
1156 if (!is_cal_pci_dev(dev->device))
1157 continue;
1158
1159 info = &bus_info[dev->bus->number];
1160 if (info->translation_disabled) {
1161 calgary_init_one_nontraslated(dev);
1162 continue;
1163 }
1164
1165 if (!info->tce_space && !translate_empty_slots)
1166 continue;
1167
1168 ret = calgary_init_one(dev);
1169 if (ret)
1170 goto error;
1171 } while (1);
1172
1173 dev = NULL;
1174 for_each_pci_dev(dev) {
1175 struct iommu_table *tbl;
1176
1177 tbl = find_iommu_table(&dev->dev);
1178
1179 if (translation_enabled(tbl))
1180 dev->dev.archdata.dma_ops = &calgary_dma_ops;
1181 }
1182
1183 return ret;
1184
1185error:
1186 do {
1187 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1188 if (!dev)
1189 break;
1190 if (!is_cal_pci_dev(dev->device))
1191 continue;
1192
1193 info = &bus_info[dev->bus->number];
1194 if (info->translation_disabled) {
1195 pci_dev_put(dev);
1196 continue;
1197 }
1198 if (!info->tce_space && !translate_empty_slots)
1199 continue;
1200
1201 calgary_disable_translation(dev);
1202 calgary_free_bus(dev);
1203 pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
1204 dev->dev.archdata.dma_ops = NULL;
1205 } while (1);
1206
1207 return ret;
1208}
1209
1210static inline int __init determine_tce_table_size(void)
1211{
1212 int ret;
1213
1214 if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
1215 return specified_table_size;
1216
1217 if (is_kdump_kernel() && saved_max_pfn) {
1218 /*
1219 * Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
1220 * TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
1221 * larger table size has twice as many entries, so shift the
1222 * max ram address by 13 to divide by 8K and then look at the
1223 * order of the result to choose between 0-7.
1224 */
1225 ret = get_order((saved_max_pfn * PAGE_SIZE) >> 13);
1226 if (ret > TCE_TABLE_SIZE_8M)
1227 ret = TCE_TABLE_SIZE_8M;
1228 } else {
1229 /*
1230 * Use 8M by default (suggested by Muli) if it's not
1231 * kdump kernel and saved_max_pfn isn't set.
1232 */
1233 ret = TCE_TABLE_SIZE_8M;
1234 }
1235
1236 return ret;
1237}
1238
1239static int __init build_detail_arrays(void)
1240{
1241 unsigned long ptr;
1242 unsigned numnodes, i;
1243 int scal_detail_size, rio_detail_size;
1244
1245 numnodes = rio_table_hdr->num_scal_dev;
1246 if (numnodes > MAX_NUMNODES){
1247 printk(KERN_WARNING
1248 "Calgary: MAX_NUMNODES too low! Defined as %d, "
1249 "but system has %d nodes.\n",
1250 MAX_NUMNODES, numnodes);
1251 return -ENODEV;
1252 }
1253
1254 switch (rio_table_hdr->version){
1255 case 2:
1256 scal_detail_size = 11;
1257 rio_detail_size = 13;
1258 break;
1259 case 3:
1260 scal_detail_size = 12;
1261 rio_detail_size = 15;
1262 break;
1263 default:
1264 printk(KERN_WARNING
1265 "Calgary: Invalid Rio Grande Table Version: %d\n",
1266 rio_table_hdr->version);
1267 return -EPROTO;
1268 }
1269
1270 ptr = ((unsigned long)rio_table_hdr) + 3;
1271 for (i = 0; i < numnodes; i++, ptr += scal_detail_size)
1272 scal_devs[i] = (struct scal_detail *)ptr;
1273
1274 for (i = 0; i < rio_table_hdr->num_rio_dev;
1275 i++, ptr += rio_detail_size)
1276 rio_devs[i] = (struct rio_detail *)ptr;
1277
1278 return 0;
1279}
1280
1281static int __init calgary_bus_has_devices(int bus, unsigned short pci_dev)
1282{
1283 int dev;
1284 u32 val;
1285
1286 if (pci_dev == PCI_DEVICE_ID_IBM_CALIOC2) {
1287 /*
1288 * FIXME: properly scan for devices across the
1289 * PCI-to-PCI bridge on every CalIOC2 port.
1290 */
1291 return 1;
1292 }
1293
1294 for (dev = 1; dev < 8; dev++) {
1295 val = read_pci_config(bus, dev, 0, 0);
1296 if (val != 0xffffffff)
1297 break;
1298 }
1299 return (val != 0xffffffff);
1300}
1301
1302/*
1303 * calgary_init_bitmap_from_tce_table():
1304 * Function for kdump case. In the second/kdump kernel initialize
1305 * the bitmap based on the tce table entries obtained from first kernel
1306 */
1307static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl)
1308{
1309 u64 *tp;
1310 unsigned int index;
1311 tp = ((u64 *)tbl->it_base);
1312 for (index = 0 ; index < tbl->it_size; index++) {
1313 if (*tp != 0x0)
1314 set_bit(index, tbl->it_map);
1315 tp++;
1316 }
1317}
1318
1319/*
1320 * get_tce_space_from_tar():
1321 * Function for kdump case. Get the tce tables from first kernel
1322 * by reading the contents of the base address register of calgary iommu
1323 */
1324static void __init get_tce_space_from_tar(void)
1325{
1326 int bus;
1327 void __iomem *target;
1328 unsigned long tce_space;
1329
1330 for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1331 struct calgary_bus_info *info = &bus_info[bus];
1332 unsigned short pci_device;
1333 u32 val;
1334
1335 val = read_pci_config(bus, 0, 0, 0);
1336 pci_device = (val & 0xFFFF0000) >> 16;
1337
1338 if (!is_cal_pci_dev(pci_device))
1339 continue;
1340 if (info->translation_disabled)
1341 continue;
1342
1343 if (calgary_bus_has_devices(bus, pci_device) ||
1344 translate_empty_slots) {
1345 target = calgary_reg(bus_info[bus].bbar,
1346 tar_offset(bus));
1347 tce_space = be64_to_cpu(readq(target));
1348 tce_space = tce_space & TAR_SW_BITS;
1349
1350 tce_space = tce_space & (~specified_table_size);
1351 info->tce_space = (u64 *)__va(tce_space);
1352 }
1353 }
1354 return;
1355}
1356
1357static int __init calgary_iommu_init(void)
1358{
1359 int ret;
1360
1361 /* ok, we're trying to use Calgary - let's roll */
1362 printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
1363
1364 ret = calgary_init();
1365 if (ret) {
1366 printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
1367 "falling back to no_iommu\n", ret);
1368 return ret;
1369 }
1370
1371 return 0;
1372}
1373
1374int __init detect_calgary(void)
1375{
1376 int bus;
1377 void *tbl;
1378 int calgary_found = 0;
1379 unsigned long ptr;
1380 unsigned int offset, prev_offset;
1381 int ret;
1382
1383 /*
1384 * if the user specified iommu=off or iommu=soft or we found
1385 * another HW IOMMU already, bail out.
1386 */
1387 if (no_iommu || iommu_detected)
1388 return -ENODEV;
1389
1390 if (!use_calgary)
1391 return -ENODEV;
1392
1393 if (!early_pci_allowed())
1394 return -ENODEV;
1395
1396 printk(KERN_DEBUG "Calgary: detecting Calgary via BIOS EBDA area\n");
1397
1398 ptr = (unsigned long)phys_to_virt(get_bios_ebda());
1399
1400 rio_table_hdr = NULL;
1401 prev_offset = 0;
1402 offset = 0x180;
1403 /*
1404 * The next offset is stored in the 1st word.
1405 * Only parse up until the offset increases:
1406 */
1407 while (offset > prev_offset) {
1408 /* The block id is stored in the 2nd word */
1409 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
1410 /* set the pointer past the offset & block id */
1411 rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
1412 break;
1413 }
1414 prev_offset = offset;
1415 offset = *((unsigned short *)(ptr + offset));
1416 }
1417 if (!rio_table_hdr) {
1418 printk(KERN_DEBUG "Calgary: Unable to locate Rio Grande table "
1419 "in EBDA - bailing!\n");
1420 return -ENODEV;
1421 }
1422
1423 ret = build_detail_arrays();
1424 if (ret) {
1425 printk(KERN_DEBUG "Calgary: build_detail_arrays ret %d\n", ret);
1426 return -ENOMEM;
1427 }
1428
1429 specified_table_size = determine_tce_table_size();
1430
1431 for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1432 struct calgary_bus_info *info = &bus_info[bus];
1433 unsigned short pci_device;
1434 u32 val;
1435
1436 val = read_pci_config(bus, 0, 0, 0);
1437 pci_device = (val & 0xFFFF0000) >> 16;
1438
1439 if (!is_cal_pci_dev(pci_device))
1440 continue;
1441
1442 if (info->translation_disabled)
1443 continue;
1444
1445 if (calgary_bus_has_devices(bus, pci_device) ||
1446 translate_empty_slots) {
1447 /*
1448 * If it is kdump kernel, find and use tce tables
1449 * from first kernel, else allocate tce tables here
1450 */
1451 if (!is_kdump_kernel()) {
1452 tbl = alloc_tce_table();
1453 if (!tbl)
1454 goto cleanup;
1455 info->tce_space = tbl;
1456 }
1457 calgary_found = 1;
1458 }
1459 }
1460
1461 printk(KERN_DEBUG "Calgary: finished detection, Calgary %s\n",
1462 calgary_found ? "found" : "not found");
1463
1464 if (calgary_found) {
1465 iommu_detected = 1;
1466 calgary_detected = 1;
1467 printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected.\n");
1468 printk(KERN_INFO "PCI-DMA: Calgary TCE table spec is %d\n",
1469 specified_table_size);
1470
1471 x86_init.iommu.iommu_init = calgary_iommu_init;
1472 }
1473 return calgary_found;
1474
1475cleanup:
1476 for (--bus; bus >= 0; --bus) {
1477 struct calgary_bus_info *info = &bus_info[bus];
1478
1479 if (info->tce_space)
1480 free_tce_table(info->tce_space);
1481 }
1482 return -ENOMEM;
1483}
1484
1485static int __init calgary_parse_options(char *p)
1486{
1487 unsigned int bridge;
1488 unsigned long val;
1489 size_t len;
1490 ssize_t ret;
1491
1492 while (*p) {
1493 if (!strncmp(p, "64k", 3))
1494 specified_table_size = TCE_TABLE_SIZE_64K;
1495 else if (!strncmp(p, "128k", 4))
1496 specified_table_size = TCE_TABLE_SIZE_128K;
1497 else if (!strncmp(p, "256k", 4))
1498 specified_table_size = TCE_TABLE_SIZE_256K;
1499 else if (!strncmp(p, "512k", 4))
1500 specified_table_size = TCE_TABLE_SIZE_512K;
1501 else if (!strncmp(p, "1M", 2))
1502 specified_table_size = TCE_TABLE_SIZE_1M;
1503 else if (!strncmp(p, "2M", 2))
1504 specified_table_size = TCE_TABLE_SIZE_2M;
1505 else if (!strncmp(p, "4M", 2))
1506 specified_table_size = TCE_TABLE_SIZE_4M;
1507 else if (!strncmp(p, "8M", 2))
1508 specified_table_size = TCE_TABLE_SIZE_8M;
1509
1510 len = strlen("translate_empty_slots");
1511 if (!strncmp(p, "translate_empty_slots", len))
1512 translate_empty_slots = 1;
1513
1514 len = strlen("disable");
1515 if (!strncmp(p, "disable", len)) {
1516 p += len;
1517 if (*p == '=')
1518 ++p;
1519 if (*p == '\0')
1520 break;
1521 ret = kstrtoul(p, 0, &val);
1522 if (ret)
1523 break;
1524
1525 bridge = val;
1526 if (bridge < MAX_PHB_BUS_NUM) {
1527 printk(KERN_INFO "Calgary: disabling "
1528 "translation for PHB %#x\n", bridge);
1529 bus_info[bridge].translation_disabled = 1;
1530 }
1531 }
1532
1533 p = strpbrk(p, ",");
1534 if (!p)
1535 break;
1536
1537 p++; /* skip ',' */
1538 }
1539 return 1;
1540}
1541__setup("calgary=", calgary_parse_options);
1542
1543static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
1544{
1545 struct iommu_table *tbl;
1546 unsigned int npages;
1547 int i;
1548
1549 tbl = pci_iommu(dev->bus);
1550
1551 for (i = 0; i < 4; i++) {
1552 struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
1553
1554 /* Don't give out TCEs that map MEM resources */
1555 if (!(r->flags & IORESOURCE_MEM))
1556 continue;
1557
1558 /* 0-based? we reserve the whole 1st MB anyway */
1559 if (!r->start)
1560 continue;
1561
1562 /* cover the whole region */
1563 npages = resource_size(r) >> PAGE_SHIFT;
1564 npages++;
1565
1566 iommu_range_reserve(tbl, r->start, npages);
1567 }
1568}
1569
1570static int __init calgary_fixup_tce_spaces(void)
1571{
1572 struct pci_dev *dev = NULL;
1573 struct calgary_bus_info *info;
1574
1575 if (no_iommu || swiotlb || !calgary_detected)
1576 return -ENODEV;
1577
1578 printk(KERN_DEBUG "Calgary: fixing up tce spaces\n");
1579
1580 do {
1581 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1582 if (!dev)
1583 break;
1584 if (!is_cal_pci_dev(dev->device))
1585 continue;
1586
1587 info = &bus_info[dev->bus->number];
1588 if (info->translation_disabled)
1589 continue;
1590
1591 if (!info->tce_space)
1592 continue;
1593
1594 calgary_fixup_one_tce_space(dev);
1595
1596 } while (1);
1597
1598 return 0;
1599}
1600
1601/*
1602 * We need to be call after pcibios_assign_resources (fs_initcall level)
1603 * and before device_initcall.
1604 */
1605rootfs_initcall(calgary_fixup_tce_spaces);
1606
1607IOMMU_INIT_POST(detect_calgary);